The Armacham 10mm High Velocity Penetrator is a weapons-grade nail gun, firing 10mm steel stakes at lethal speeds. It can pin opponents to walls if the target is near a wall when they are hit with a fatal shot, and is found in F.E.A.R. First Encounter Assault Recon, F.E.A.R. Extraction Point and F.E.A.R. Perseus Mandate.
The Penetrator is fielded by Replica forces as the standard issue firearm of the Heavy Armors, and are sometimes found in use by Replica Elite Soldiers. This weapon is also commonly found in weapons stashes.
The Penetrator appears in F.E.A.R.: Extraction Point, and functions exactly like in the first game, though ammo is slightly more common.
The Penetrator also appears in F.E.A.R.: Perseus Mandate, where ammunition becomes more abundant, especially in Interval 05 and onwards. Players may find that the extra ammunition allows the weapon to become a viable alternative to more commonly used weapons, such as the G2A2 Assault Rifle.
- The HV Penetrator is one of the most accurate weapons in the game, which makes it very useful for taking out targets in partial cover or at longer range. The HV Penetrator is a slow-firing weapon, but it made up its slow ROF with accuracy and base damage. It boasts higher damage than both the RPL Submachinegun and, in some cases, the G2A2. Its magazine and fire rate are correspondingly lower. Because of the weapon's high accuracy, Slow-Mo is especially effective, allowing for easier precision targeting.
- Although it does have good accuracy, it is ill advised in firing this weapon while moving. It suffers from high "bullet" spread, making it quite inaccurate. Therefore, it is recommended to remain stationary and zoom-in. Three to four shots to the head are enough to eliminate most Replica soldiers, while the fire rate is low enough to make single snap-shots easy to perform.
- The rounds fired by the HV Penetrator have an armor piercing property which makes them effective against hardened targets, such as the REV6 Powered Armor and Replica Heavy Armor. However, against defense turrets or Unmanned Aerial Vehicles, the armor penetration has no benefit, as these enemies are programmed with no armor and are durable due to high base health only. Against these targets, other weapons, such as the G2A2 assault rifle or VK-12 Combat Shotgun, are more efficient.
- Penetrator ammunition is uncommon until mid-game, so the player should try to conserve its ammo by using it only when its strengths are put to best use. It is a good idea to save ammunition for armored enemies and use it on light targets only when ammo is in excess.
- Like the pistol and MP-50 Repeating Cannon, this weapon is highly effective against Nightmares, as long as the hit is scored, it is a guaranteed kill, although the reloading sequence is long enough to leave the user very vulnerable if there are too many Nightmares.
- Combining the HV Penetrator and VES Advanced Rifle is a good option in Perseus Mandate, while VES is enough for regular soldiers, HV Penetrator is more effective against armored targets.
- The label "NGD-7" can be seen on the stock of the Penetrator, though it is not clear what the label stands for or signifies.
- The Penetrator can also pin enemies to surfaces other than walls, even to ceilings, if fired upwards from below the target.
- The Penetrator is sometimes called the "tentpole gun" by players, due to the large rods it fires, which stay stuck into victims.
- Although the weapon has a vertical stubby foregrip, it is never used by either enemies or the player.
- The stakes fired by the Penetrator are bigger than what the barrel and magazine would allow, suggesting that the spikes expand after they exit the barrel.
- The Penetrator can fire full-auto if the player leans on the trigger, the rate of fire is about the same as the G2A2 assault rifle.
- The Penetrator has a crude three-pronged iron sight, which is never used by the player or enemies.
- If using against enemies that explode upon death, like Turrets or REV6es, none of the enemies' body parts will be stuck to the environment like standard enemies killed with the Penetrator, this is because these types of enemies are programmed to explode, and as such this will override the Penetrator's "pinning" properties.